Topic: Why not just use this bad boy...Brightsign XT1143
For $650, only a little more than the NETV2. You can get a BrightSign XT1143 that is a VERY fast, enterprise level, with full authoring software. It does 4K, DRM, live upates to any kind of overlay you can think of (Video, Audio, Test, etc...)
I use these at home with HomeSeer to send 'messages' and overlays to my various TV's...works instantly, high quality, and over IP.